Working on drawing sun and sun halo.
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curt
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0fa3a329e8
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99a59763f1
@ -104,11 +104,11 @@ bool FGSkyDome::initialize( ) {
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dome_state = new ssgSimpleState();
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dome_state->setShadeModel( GL_SMOOTH );
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dome_state->disable( GL_LIGHTING );
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dome_state->disable( GL_DEPTH_TEST );
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dome_state->disable( GL_CULL_FACE );
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dome_state->disable( GL_TEXTURE_2D );
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dome_state->enable( GL_COLOR_MATERIAL );
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dome_state->setColourMaterial( GL_AMBIENT_AND_DIFFUSE );
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dome_state->disable( GL_BLEND );
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// initialize arrays
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center_disk_vl = new ssgVertexArray( 14 );
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@ -44,25 +44,97 @@ FGSkySun::~FGSkySun( void ) {
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}
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static GLuint makeHalo( GLubyte *sun_texbuf ) {
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int texWidth = 64; // 64x64 is plenty
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int texSize;
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GLuint texid;
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GLubyte *p;
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int i,j;
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double radius;
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// create a texture id
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#ifdef GL_VERSION_1_1
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glGenTextures(1, &texid);
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glBindTexture(GL_TEXTURE_2D, texid);
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#elif GL_EXT_texture_object
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glGenTexturesEXT(1, &texid);
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glBindTextureEXT(GL_TEXTURE_2D, texid);
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#else
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# error port me
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#endif
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glPixelStorei( GL_UNPACK_ALIGNMENT, 4 );
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glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
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glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
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glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
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// create the actual texture contents
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texSize = texWidth * texWidth;
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sun_texbuf = new GLubyte[texSize*4];
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if ( !sun_texbuf ) {
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return 0; // Ugly!
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}
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p = sun_texbuf;
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radius = (double)(texWidth / 2);
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for (i=0; i < texWidth; i++) {
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for (j=0; j < texWidth; j++) {
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double x, y, d;
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*p = 0xff;
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*(p+1) = 0xff;
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*(p+2) = 0xff;
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x = fabs((double)(i - (texWidth / 2)));
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y = fabs((double)(j - (texWidth / 2)));
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d = sqrt((x * x) + (y * y));
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if (d < radius) {
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// t is 1.0 at center, 0.0 at edge
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double t = 1.0 - (d / radius);
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// inverse square looks nice
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*(p+3) = (int)((double) 0xff * (t*t));
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} else {
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*(p+3) = 0x00;
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}
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p += 4;
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}
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}
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glTexImage2D( GL_TEXTURE_2D,
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0,
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GL_RGBA,
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texWidth, texWidth,
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0,
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GL_RGBA, GL_UNSIGNED_BYTE,
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sun_texbuf );
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return texid;
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}
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// initialize the sun object and connect it into our scene graph root
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bool FGSkySun::initialize() {
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// create the scene graph for the dome
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// create the scene graph for the sun/halo
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skysun = new ssgRoot;
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skysun->setName( "Sky Sun" );
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// set up the state
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// set up the orb state
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orb_state = new ssgSimpleState();
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orb_state->setShadeModel( GL_SMOOTH );
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orb_state->disable( GL_LIGHTING );
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orb_state->disable( GL_DEPTH_TEST );
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orb_state->disable( GL_CULL_FACE );
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orb_state->disable( GL_TEXTURE_2D );
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orb_state->enable( GL_COLOR_MATERIAL );
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orb_state->setColourMaterial( GL_AMBIENT_AND_DIFFUSE );
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orb_state->disable( GL_BLEND );
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cl = new ssgColourArray( 1 );
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ssgBranch *orb = ssgMakeSphere( orb_state, cl, 550.0, 10, 10 );
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// force a repaint of the sun colors with arbitrary defaults
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@ -82,6 +154,51 @@ bool FGSkySun::initialize() {
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skysun->addKid( sun_selector );
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// set up the halo state
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halo_state = new ssgSimpleState();
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halo_state->setShadeModel( GL_SMOOTH );
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halo_state->disable( GL_LIGHTING );
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halo_state->disable( GL_CULL_FACE );
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halo_state->enable( GL_TEXTURE_2D );
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halo_state->enable( GL_COLOR_MATERIAL );
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halo_state->setColourMaterial( GL_AMBIENT_AND_DIFFUSE );
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halo_state->enable( GL_BLEND );
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halo_state->setTranslucent();
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// build the halo
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sun_texid = makeHalo( sun_texbuf );
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halo_state->setTexture( sun_texid );
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cout << "set texture" << endl;;
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// Build ssg structure
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sgVec3 v3;
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halo_vl = new ssgVertexArray;
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sgSetVec3( v3, -5000.0, 0.0, -5000.0 );
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halo_vl->add( v3 );
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sgSetVec3( v3, 5000.0, 0.0, -5000.0 );
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halo_vl->add( v3 );
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sgSetVec3( v3, 5000.0, 0.0, 5000.0 );
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halo_vl->add( v3 );
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sgSetVec3( v3, -5000.0, 0.0, 5000.0 );
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halo_vl->add( v3 );
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sgVec2 v2;
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halo_tl = new ssgTexCoordArray;
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sgSetVec2( v2, 0.0f, 0.0f );
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halo_tl->add( v2 );
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sgSetVec2( v2, 1.0, 0.0 );
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halo_tl->add( v2 );
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sgSetVec2( v2, 1.0, 1.0 );
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halo_tl->add( v2 );
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sgSetVec2( v2, 0.0, 1.0 );
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halo_tl->add( v2 );
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ssgLeaf *halo =
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new ssgVtxTable ( GL_QUADS, halo_vl, NULL, halo_tl, cl );
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halo->setState( halo_state);
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sun_transform->addKid( halo );
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return true;
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}
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@ -114,7 +231,8 @@ bool FGSkySun::repaint( double sun_angle ) {
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if (color[1] > 1.0) color[1] = 1.0;
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if (color[2] > 1.0) color[2] = 1.0;
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cout << "color = " << color[0] << " " << color[1] << " " << color[2] << endl;
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// cout << "color = " << color[0] << " " << color[1] << " "
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// << color[2] << endl;
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float *ptr;
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ptr = cl->get( 0 );
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@ -198,11 +316,11 @@ Star::Star(FGTime *t) :
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FG_LOG( FG_GENERAL, FG_INFO, "Initializing Sun Texture");
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#ifdef GL_VERSION_1_1
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xglGenTextures(1, &sun_texid);
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xglBindTexture(GL_TEXTURE_2D, sun_texid);
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glGenTextures(1, &sun_texid);
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glBindTexture(GL_TEXTURE_2D, sun_texid);
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#elif GL_EXT_texture_object
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xglGenTexturesEXT(1, &sun_texid);
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xglBindTextureEXT(GL_TEXTURE_2D, sun_texid);
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glGenTexturesEXT(1, &sun_texid);
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glBindTextureEXT(GL_TEXTURE_2D, sun_texid);
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#else
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# error port me
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#endif
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@ -368,12 +486,12 @@ void Star::newImage(void)
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if (amb[0] > 1.0) amb[0] = 1.0;
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if (amb[1] > 1.0) amb[1] = 1.0;
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if (amb[2] > 1.0) amb[2] = 1.0;
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xglColor3fv(amb);
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glColor3fv(amb);
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glPushMatrix();
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{
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xglRotatef(((RAD_TO_DEG * rightAscension)- 90.0), 0.0, 0.0, 1.0);
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xglRotatef((RAD_TO_DEG * declination), 1.0, 0.0, 0.0);
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xglTranslatef(0,60000,0);
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glRotatef(((RAD_TO_DEG * rightAscension)- 90.0), 0.0, 0.0, 1.0);
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glRotatef((RAD_TO_DEG * declination), 1.0, 0.0, 0.0);
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glTranslatef(0,60000,0);
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if (current_options.get_textures())
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{
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glEnable(GL_TEXTURE_2D); // TEXTURE ENABLED
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@ -391,8 +509,8 @@ void Star::newImage(void)
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glTexCoord2f(0.0f, 1.0f); glVertex3f(-5000, 0.0, 5000);
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glEnd();
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}
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xglDisable(GL_TEXTURE_2D); // TEXTURE DISABLED
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xglDisable(GL_BLEND); // BLEND DISABLED
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glDisable(GL_TEXTURE_2D); // TEXTURE DISABLED
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glDisable(GL_BLEND); // BLEND DISABLED
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}
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glPopMatrix();
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@ -400,10 +518,10 @@ void Star::newImage(void)
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glDisable(GL_BLEND); // BLEND DISABLED
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glPushMatrix();
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{
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xglRotatef(((RAD_TO_DEG * rightAscension)- 90.0), 0.0, 0.0, 1.0);
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xglRotatef((RAD_TO_DEG * declination), 1.0, 0.0, 0.0);
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xglColor4fv(amb);
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xglTranslatef(0,60000,0);
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glRotatef(((RAD_TO_DEG * rightAscension)- 90.0), 0.0, 0.0, 1.0);
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glRotatef((RAD_TO_DEG * declination), 1.0, 0.0, 0.0);
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glColor4fv(amb);
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glTranslatef(0,60000,0);
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gluSphere( SunObject, sun_size, 10, 10 );
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}
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glPopMatrix();
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@ -43,6 +43,12 @@ class FGSkySun {
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ssgColourArray *cl;
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ssgVertexArray *halo_vl;
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ssgTexCoordArray *halo_tl;
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GLuint sun_texid;
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GLubyte *sun_texbuf;
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public:
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// Constructor
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